saying, quote, "after 18 months of due diligence, we have concluded that it is a certainty that herbalife is a pyramid scheme to the extent that mr. icahn is helping achieve this objective, we welcome his involvement." betting a stock will go down is not very popular, but ackman is sticking to his guns. just who will blink first is anybody's guess, but hedge fund watchers point out icahn's investment is his own money, ileckman's fund pershing square has investors who could force him to throw in the towel, if shares of herbalife continue to move higher. ruben ramirez, "n.b.r.," new york. >> tom: the more than 4,000 people from carnival's "triumph" cruise ship are back on land after going without power or plumbing for days in the gulf of mexico. an engine-room fire on sunday knocked out power, leading to over-flowing toilets, no air conditioning and deteriorating living conditions while the ship was towed to mobile, alabama. allison worrell reports on how the ill-fated cruise could pact carnival's future.